Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 0);

Bundle extras = data.getExtras();
Bitmap b = (Bitmap) extras.get("data");

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
public class Camera1 extends Activity implements SurfaceHolder.Callback {
  SurfaceView sfView;
  SurfaceHolder sfHolder;
  Camera camera;
  Button btn1, btn2;
  byte[] bitmpdata;
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    btn1 = (Button) findViewById(R.id.btn1);
    btn2 = (Button) findViewById(R.id.btn2);
    sfView = (SurfaceView) findViewById(R.id.surface1);
    sfHolder = sfView.getHolder();
    sfHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); // 必須有類型才能顯示，否則不會顯示
    sfHolder.addCallback(this);
    btn1.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        // TODO Auto-generated method stub
        camera.takePicture(null, null, picCallback);
      }
    });
    btn2.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        // TODO Auto-generated method stub
        savePic();
      }
    });
  }
  public void surfaceChanged(SurfaceHolder holder, int format, int width,
      int height) {
    // TODO Auto-generated method stub
    Camera.Parameters parameters = camera.getParameters();
    parameters.setPictureFormat(PixelFormat.JPEG);
    parameters.setPreviewSize(width, height);
    parameters.setPictureSize(320, 480);
    camera.setParameters(parameters);
    camera.startPreview();
  }
  public void surfaceCreated(SurfaceHolder holder) {
    // TODO Auto-generated method stub
    try {
      camera = Camera.open();
      camera.setPreviewDisplay(sfHolder);
      camera.autoFocus(new Camera.AutoFocusCallback() {
        public void onAutoFocus(boolean success, Camera camera) {
          // TODO Auto-generated method stub
          if (success)
            camera.takePicture(null, null, picCallback);
        }
      });
    } catch (Exception e) {
      camera.release();
      camera = null;
    }
  }
  public void surfaceDestroyed(SurfaceHolder holder) {
    // TODO Auto-generated method stub
    camera.stopPreview();
    camera = null;
  }
  private PictureCallback picCallback = new PictureCallback() {
    public void onPictureTaken(byte[] data, Camera camera) {
      // TODO Auto-generated method stub
      bitmpdata = data;
    }
  };
  private void savePic() {
    try {
      Bitmap bitmap = BitmapFactory.decodeByteArray(bitmpdata, 0,
          bitmpdata.length);
      File file = new File("/sdcard/camera1.jpg");
      BufferedOutputStream bos = new BufferedOutputStream(
          new FileOutputStream(file));
      bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos);
      bos.flush();
      bos.close();
      // Canvas canvas= sfHolder.lockCanvas();
      // canvas.drawBitmap(bitmap, 0,0, null);
      // sfHolder.unlockCanvasAndPost(canvas);
      camera.stopPreview();
      camera.startPreview();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

sfHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
// 必須有類型才能顯示，否則不會顯示